London (CNN)From Brexit to #Regrexit -- an online petition demanding a second referendum on Britain's decision to leave the EU has passed 2 million signatures.

By Saturday afternoon, more than 2 million people had signed the petition on the official UK Parliament website. That number takes it well over the 100,000-signature threshold needed to force a debate on the issue by members of Parliament.A rush to sign the petition caused the website to crash temporarily due to the high volume of traffic.

One voter, Adam from Manchester, told the BBC: "My vote -- I didn't think was going to matter too much because I thought we were just going to remain."The David Cameron resignation has blown me away to be honest. I think the period of uncertainty we're going to have for the next few months has been magnified, so I'm quite worried."

Another "Leave" voter, Mandy, told the London Evening Standard that she would change her vote if she could."This morning the reality is actually hitting in and the regret is hitting in," she said Friday. "I wish I had the opportunity to vote again, simply because I would do things differently."

London (CNN)From Brexit to #Regrexit -- an online petition demanding a second referendum on Britain's decision to leave the EU has passed 2 million signatures.

By Saturday afternoon, more than 2 million people had signed the petition on the official UK Parliament website. That number takes it well over the 100,000-signature threshold needed to force a debate on the issue by members of Parliament.A rush to sign the petition caused the website to crash temporarily due to the high volume of traffic.

One voter, Adam from Manchester, told the BBC: "My vote -- I didn't think was going to matter too much because I thought we were just going to remain."The David Cameron resignation has blown me away to be honest. I think the period of uncertainty we're going to have for the next few months has been magnified, so I'm quite worried."

Another "Leave" voter, Mandy, told the London Evening Standard that she would change her vote if she could."This morning the reality is actually hitting in and the regret is hitting in," she said Friday. "I wish I had the opportunity to vote again, simply because I would do things differently."